The thrust bearing shown in the illustration has over eight years of ahead running time. Measurements show "i1" is 4 mm and "i2" is 1mm. Which of the following conditions is indicated and what steps should be taken, if any? Illustration MO-0121

Correct Answer: Option D — No appreciable wear has occurred, and the proper maintenance procedures should continue to be followed.

Thrust bearing clearances change gradually over extended operating periods due to normal hydrodynamic film wear. The measured values indicate that the remaining babbitt thickness and axial float are well within acceptable manufacturer tolerances, requiring only standard routine monitoring.